请问psp的卡片2如何与ps2的mgs3 sub 互动？

blackberry07

卡片2的说明书里有这样一段话：

    MGS3 SUBSISTENCE LINK
    Using a usb A/ mini B cable (sold separately),you can cinnect "METAL GEAR SOLID 3 SUBSISTENC" and  METAL GEAR ACID 2.
    NOTE: METAL GEAR ACID 2 only links to MGS3 SUBSISTENCE after acquiring the camera in s*** eater on disc 1 of MGS3 SUBSISTENCE.
    this link may only be made while in the s*** eater game.

   似乎说用借口合适的usb线就能联动两个游戏，谁知道具体是怎么作的？联动后有什么效果？.